Double-Beam Interferometer

Two parallel measuring beams are used to acquire two length values independently of each other. So it is possible to determine the position, angle and difference values simultaneously.



SP-DS Series

  • Selectable materials of sensor head: aluminium, stainless steel or Invar
  • Open interfaces for OEM software under Windows or Linux


  • Simultaneous length and angle measurement or differential measurement
  • Beam distance selectable
  • Combinable with plane mirror, cat-eye or hollow reflector


  • OEM measuring system for laser-interferometric precision length measurement and calibration of coordinate and length measuring machines, machine tools, measuring and positioning tables

  • Differential measurement, e.g. material testing, dilatometry or deflection and drift behaviour investigations
  • Simultaneous length and angle measurements of positioning stages or machine calibration


Technical Data:
  • Measurement range: up to 2 m with plane mirror
  • Angle resolution: 0.001 to 0.005 arcsec (depending on selected beam separation)
  • Angle measurement with cat-eye reflector: up to ±5°

Triple-Beam Interferometer

Three laser interferometer included in one unit detect three different length values independently. So it is possible to measure the position and two angles or difference values simultaneously.



SP-TR Series

  • The sensor head may be made of aluminium, stainless steel or invar
  • Open interfaces for OEM software under Windows and Linux


  • Simultaneous measurement of length, pitch and yaw angle
  • Straightness measurement on guides and axes with angle test procedure acc. DIN ISO 230-1 in only one step (without any modification)
  • Calibration software for displaying the results
  • Correction of measurement errors according Abbe offset possible
  • Detection of the tilt center position


  • Laser-interferometric measurements on guides and translations, microscopes, measurement and positioning stages
  • High precision pitch and yaw corrections during biaxial or multi-axial length measurements
  • Calibration of metrological equipment and machine tools
  • Differential measurements (dilatometry, materials testing)
  • Extension of the measuring range for angle measurement upon request


Technical Data:
  • Measurement range: up to 2 m with plane mirror
  • Beam distance: 12 mm
  • Angle resolution: 0.002 arcsec
  • Angle measurement with cat-eye reflector: until ±12.5°


Additional Information
Double-Beam Plane-Mirror Interferometer - SP-DS Series Data Sheet
Triple-Beam Plane-Mirror Interferometer - SP-TR Series Data Sheet


For your demonstration please contact Armstrong Optical (44 (0)1604 654220) or CLICK HERE

Price: £0.00